/** Runs the recognition loop. */
private void recognizeThread() {
if (mAlive) {
return;
}
mAlive = true;
if (Config.DEBUG) {
Log.e(TAG, "Started recognition thread");
}
InputStream mic = null;
boolean recognizerStarted = false;
// Possible results...
String error = null;
TreeSet<GrammarResult> results = null;
boolean failure = false;
try {
mic = new MicrophoneInputStream(SAMPLE_RATE, SAMPLE_RATE * 15);
mSrec.start();
recognizerStarted = true;
while (mAlive) {
if (Thread.interrupted()) {
throw new InterruptedException();
}
int event = mSrec.advance();
if (Config.DEBUG
&& event != Recognizer.EVENT_INCOMPLETE
&& event != Recognizer.EVENT_NEED_MORE_AUDIO) {
Log.e(TAG, "event=" + event);
}
switch (event) {
case Recognizer.EVENT_INCOMPLETE:
case Recognizer.EVENT_STARTED:
case Recognizer.EVENT_START_OF_VOICING:
case Recognizer.EVENT_END_OF_VOICING:
break;
case Recognizer.EVENT_START_OF_UTTERANCE_TIMEOUT:
if (Config.DEBUG) {
Log.e(TAG, "Didn't hear anything, restarting");
}
mSrec.stop();
mSrec.start();
break;
case Recognizer.EVENT_NO_MATCH:
if (Config.DEBUG) {
Log.e(TAG, "No match, return not recognized");
}
mAlive = false;
failure = true;
break;
case Recognizer.EVENT_RECOGNITION_RESULT:
if (Config.DEBUG) {
Log.e(TAG, "Recognized something, return it");
}
mAlive = false;
results = getRecognitionResults();
break;
case Recognizer.EVENT_NEED_MORE_AUDIO:
mSrec.putAudio(mic);
break;
default:
if (Config.DEBUG) {
Log.e(TAG, "Received invalid event=" + event);
}
mAlive = false;
error = Recognizer.eventToString(event);
break;
}
}
} catch (IOException e) {
e.printStackTrace();
mListener.onRecognitionError(e.toString());
} catch (InterruptedException e) {
// do nothing
} finally {
if (mSrec != null && recognizerStarted) {
mSrec.stop();
}
try {
if (mic != null) {
mic.close();
}
} catch (IOException ex) {
ex.printStackTrace();
} finally {
mic = null;
}
// Wait until the very end to send results, otherwise we might
// overlap and crash the AudioFlinger permanently!
if (mListener != null) {
if (error != null) {
mListener.onRecognitionError(error);
} else if (results != null) {
mListener.onRecognitionSuccess(results);
} else if (failure) {
mListener.onRecognitionFailure();
}
}
}
}
